The production of strapping belts is first controlled by the temperature of the extruder, typically at 250°C to 280°C. The next step is cooling. After the material is brought out of the head, the temperature is very high, and it is necessary to immediately enter the water to cool, because the isotactic polypropylene easily generates a twin structure in the case of quenching, and the twin crystal structure is loose. Easy to stretch orientation, to obtain high quality products. This is followed by stretching. The purpose of stretching is to increase the longitudinal strength of the strap and reduce the elongation. Stretching must be carried out in boiling water, and one stretch is generally used. The last is embossing. After the stretched packing belt passes through the two patterned press rolls, it is pressed into the pattern. Its role is to increase the friction in use, not to slip, and to look beautiful from the outside.
Packing quality is good or bad, depends on the high purity of the packing tape polypropylene is not high, there are many kinds of packaging tape on the market: there are pure polypropylene, polypropylene packing tape plus masterbatch, polypropylene plus renewable materials, polypropylene plus Recycled material and masterbatch. The packing tape produced from pure polypropylene is fully transparent, the packaging ground from polypropylene and masterbatch is translucent, the packing tape produced from polypropylene and recycled materials is basically not transparent, and the packaging tape produced from polypropylene plus masterbatch and recycled material is produced. Totally opaque. There is also a packing belt for the production of whole recycled material and calcium carbonate powder sandwich material. The packing tape produced by the completely recycled material is relatively soft, and the surface of the sandwich material belt is only the raw material, and the rest is calcium carbonate powder (lime powder). The quality of the strap depends entirely on the purity of the polypropylene. The higher the purity of the polypropylene, the better the pulling force of the strap.
More packaging information can be on China's packing belt trading network
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